Liquid measuring apparatus



NQV- 1.3, 1945 D. G. ANDERSON Erm. 2,388,662

LIQUID MEASURING APPARATUS Filed Dec. 9, 1941 o n a a o e a c.. o

Patented Nov. 13, 1945 2,388,662 l LIQUID MEASURING APPARATUS Digld G. Anderson,

Clarendon Hills, and -Walter Fairileld, La Grange, Western Electric Company,

lll., asslgnors to Incorporated, New

York, N. Y., a corporation o! New York Application December 9, 1941, Serial.No.`422,248

This invention relates to liquid measuring apparatus and more particularly to an apparatus for automatically delivering a measured quantity of liquid from a supply.

,It is an object of the present invention to provide a simple and eiiicient mechanism for automatically dispensing a measured amount of liquid in response to the actuation of` a single instrumentality.

In accordance with one embodiment of the invention as applied to an a measured quantity of water to molding sand being prepared for use, a supply tank for containing a supply of water in excess of the largest amount deliverable by the apparatus is connected by means of a one-way valve with a dispensing cylinder which is, in turn, operated by the piston ci a driving cylinder under control of a valve system wherein air under pressure is deliverable to either side of the driving cylinder under control of a manually operable escape valve, and an adjustably controlled escape valve operable upon the piston of the driving cylinder reaching a predetermined point in its travel. The valve system is so set up that upon the operation I the manually operable valve a. control piston is shifted to position to feed air under pressure to one side of the driving cylinder, thereby to drive the piston of the driving cylinder in a direction to force the water out of the dispensing cylinder through a one-way valve to the dispensing point. After a predetermined amount of water has been expelled from the dispensing cylinder, an adjustable trip mechanism, operable by the piston of thesdriving cylinder, will open a second escape valve and through the control pistons admit air under pressure to the opposite end of the driving cylinder, thereby to return the piston to position to again start the cycle of operation under control of the manually actuated valve.

In the single ligure of the drawing, there is disclosed, diagrammatically, apparatus for dispensing a predetermined amount of liquid from 'ai supply in accordance With the present inven- Referring to the drawing, it will be seen that water under pressure from a source of supply (not shown) may be fed through a pipe E to a, valve 6 and if the valve 6 is open, the water from the pipe will be directed through a pipe l to an accumulator tank 8, in which there is positioned a iioat 9, mounted upon an arm III, pivoted at Il for controlling the valve 6. The arm `III is slotted at I2 to receive a pin I3 on a valve actuating rod 1 Claim. (Cl. 121.-38)

, moves downwardly in the accumulator tank 8,

apparatus for delivering the rod I4 will be drawn upwardly to open the valve 6 and permit water to enter the tank 8.

The tank 8 is equipped with an outlet pipe I5, in which there isa. check valve I6, which will permit the water in the tank 8 to flow through the pipe I5 to the left, but will prevent the water from moving to the right. Communicating with the valve IB are pipes I'I and I8, and in the pipe I8, there is provided a one-way release valve I9, which will permit water to flow upwardly through it when the pressure exerted on the water reaches a predetermined value, which is appreciably higher than the pressure on the water in pipe I 5. The valve I9 will not permit water to pass through it unless the pressure reaches said predetermined value, and, furthermore, will not perf mit the ilow of water downwardly. The pipe I8 communicates with the spray section 20, which may be used to spray water on molding sand or for any other purpose where it is desired to deliver a denite measured quantity of liquid to a given point.

The pipe Il communicates with the right end of a dispensing cylinder 25, in which there is slidable a dispensing piston 26 mounted on'a piston rod 2l. The piston rod 2l is connected to a piston 28 in an air cylinder 29 and the piston rody 2l has extending upwardly from it a trip arm 39, which is threaded at its upper end to receive a threaded valve actuating plunger 3I. The plunger 3l is adjustable and may be positioned with respect to the trip .arm 30 and cooperates with an escape valve 32 for controlling the escape of air from a pipe 33.

The pipe 33 communicates with the right end of a control valve. designated generally by the numeral 34. The control valve 34 is provided with two cylinders 35 and 36, in winch are mounted pistons 3l and 38, interconnected by a piston rod 39, which carries slide valve members 4I) and 4I in a chamber 42. The pipe 33 `communicates with the cylinder 36 to which air under pressure `is supplied through an entrance port 43, and,

similarly, a pipe 44 communicates with the cylinder 35 provided with an entrance port 45. The pipe 44 has, at its end away from the cylinder 35, an escape valve 46 adapted to be actuated by a control lever 41.

Air under pressure is supplied to the cylinders 35 and 36 through the ports 45 and 43 by pipes 48 and 49, respectively, from a pipe 50, which is connected to a source of air under pressure (not shown). The pipe 50 also has a pipe 5I in com- I4 and Awhen the float 9 u munication with it for supplying air under pressure to the chamber 42' and the air under pressure supplied through the pipe 5| to the chamber 42 will be directed to one end or the other end of the air cylinder 29 by pipes 52 and 53, depending upon the position of the slide valve members 40 and 4I. with exhaust ports 54 and 55 so that when the piston rod 39 is shifted from one position to the other, the air in one end or the other end of the cylinder 29 may be exhausted to the atmosphere under control of the slide valve members 40 and 4|. In the position shown, the left end of the air cylinder 29 is in communication with the exhaust port 54 and the pipe 5| is in communication, through pipe 52, with the right end of the air cylinder 29 so that the piston 28 is about to move to the left to recharge the dispensing cylinder 25.

In other words, the apparatus as shown in the drawing is in the condition where a measured quantity of liquid has just been dispensed through the spraying device and the pistons 28 and 26 have reached the end of their travel to the right, have caused the actuating plunger 3| to open the escape valve 32 and have permitted the air under pressure, in the cylinder 36, to escape through the pipe 33 and escape valve 32 and have permitted the air under pressure to be delivered through pipe 49 and port 45, to the cylinder 35 to drive the piston rod 99 to the position shown where the slide valve members 40 and 4| are shifted to a position such that air under pressure from pipe 5I willbe fed through pipe 52 to the right end of air ,cylinder 29 to return the piston 28 to its normalposition. Since the pressure on the pistons 3l and 38 is equa1 with both the escape valve 32 and the escape valve 46 closed, the slide valve members 40 and 4| will stay in the position shown until escape valve 46 is again opened manually, at which time the relief of pressure in the cylinder 35 and the maintenance of pressure in the cylinder 36 will cause the piston rod 39 to be shifted to the left from the position shown to carry the slide valve members 40 and 4| to a position where pipe 52 will be in communication, through chamber 42, to exhaust pipe 55 and pipe 5| will be in communication with pipe 53, thus to supply air under pressure to the left side of piston 28 and cause it to move to the right. When the piston 28 moves to the right, it will carry piston 26 in the dispensing cylinder to the right to force the water which has been permitted to ow into the dispensing cylinder out through valve I9 and pipe I8 to the dis- The chamber 42 is provided pensing device 20. This action will continue until the actuating plunger l3| actuates thel escape valve 32 to permit the air under pressure in control cyllnder 36 to escape, at which time the pressure of the air in cylinder 35 will move thev piston 39 and slide valve members 40 and 4| to the position shown, thereby to cause the piston rod 21 to be moved to the left.

Although a specic embodiment of the invention has been described hereinbefore, it will be understood that modifications thereof may be made without departing from the invention, the scope of which is to be limited only by the appended claim.

What is claimed is:

An operating and control apparatus for a liquid dispensing pump comprising a compressed air cylinder and its piston, a valve mechanism shiftable to supply air under pressure to either end of the air cylinder for actuating its piston including a pair of control cylinders a piston in each control cylinder, a piston rod rigidly interconnecting the pistons in the control cylinders, means for directing air under pressure to said control cylindersunder equal pressure normally to hold the piston rod in any position to which it has been shifted, an exhaust pipe in each of the control cylinders, an escape valve at the extremity of each of the exhaust pipes, manually operable means for opening one of said escape valves to permit the air directed to its associated control cylinder to escape from the cylinder whereby the pressure of the uid in the other control cylinder will shift the pistons interconnected by the piston rod common to them for changing the direction of flow of fluid under pressure through the valve mechanism, means on the compressed air cylinders piston for operating the other escape valve to relieve the pressure in the other control cylinder for returning the valve mechanism to its original position, and means for adiusting the position of the means on the compressed air cylinders piston with respect to the other escape valve, said valve mechanism including a valve cylinder having two main outlet passages one connected to each end of the compressed air cylinder, two exhaust ports, and an inlet port, and a pair of slide valve members attached to the piston rod and slidable in said valve cylinder alternately to connect one main outlet passage with the inlet port and the other outlet passage to one of the exhaust ports.

DAVID G. ANDERSON. WALTER B. FAIRFIELD. 

